> In what world is a hyperloop going maybe 700mph comparable to a spacecraft reentering from orbit at 17,000mph? In that case, the air can just "go around" the

> In what world is a hyperloop going maybe 700mph comparable to a spacecraft reentering from orbit at 17,000mph? In that case, the air can just "go around" the space craft. Try pushing down a syringe with the end capped. Bet you can't do it. Now imagine that at 700 mph; you will get a lot of heat and destruction. No heat shielding will save you. > Apply your safety argument to passenger airliners or even ordinary trains and you'll see that they are also "impossible to make safety guarantees" for. See sibling comment.